Haley Colvin

I'm new to gardening and my seeds just came in today, March 2nd. However, all of the packets say to start the seeds indoors in flats 6-8 weeks before the last frost date, then harden them outside, and finally transplant. I didn't think to prepare for that :{ I live in northeast Texas and my last frost date is March 10th. Can I still start them and plant them late? thanks!

Do I contact the city or the county? I'm having a hard time finding information online. We're building a small house outside city limits in Texas. I need to know if I can set up a composting toilet, if I need a septic system for some reason, and if I can use my greywater for irrigation. Also, what department would I need to contact? thanks!